/*
        100% free public domain implementation of the SHA-1 algorithm
        by Dominik Reichl <dominik.reichl@t-online.de>
        Web: http://www.dominik-reichl.de/

        Version 1.6 - 2005-02-07 (thanks to Howard Kapustein for patches)
        - You can set the endianness in your files, no need to modify the
          header file of the CSHA1 class any more
        - Aligned data support
        - Made support/compilation of the utility functions (ReportHash
          and HashFile) optional (useful, if bytes count, for example in
          embedded environments)

        Version 1.5 - 2005-01-01
        - 64-bit compiler compatibility added
        - Made variable wiping optional (define SHA1_WIPE_VARIABLES)
        - Removed unnecessary variable initializations
        - ROL32 improvement for the Microsoft compiler (using _rotl)

        ======== Test Vectors (from FIPS PUB 180-1) ========

        SHA1("abc") =
                A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D

        SHA1("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") =
                84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1

        SHA1(A million repetitions of "a") =
                34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
*/

#ifndef ___SHA1_HDR___
#define ___SHA1_HDR___

#if !defined(SHA1_UTILITY_FUNCTIONS) && !defined(SHA1_NO_UTILITY_FUNCTIONS)
#define SHA1_UTILITY_FUNCTIONS
#endif

#include <memory.h> // Needed for memset and memcpy

#ifdef SHA1_UTILITY_FUNCTIONS
#include <stdio.h>  // Needed for file access and sprintf
#include <string.h> // Needed for strcat and strcpy
#endif

#include <stdlib.h>
#include <stdint.h>

// You can define the endian mode in your files, without modifying the SHA1
// source files. Just #define SHA1_LITTLE_ENDIAN or #define SHA1_BIG_ENDIAN
// in your files, before including the SHA1.h header file. If you don't
// define anything, the class defaults to little endian.

#if !defined(SHA1_LITTLE_ENDIAN) && !defined(SHA1_BIG_ENDIAN)
#define SHA1_LITTLE_ENDIAN
#endif

// Same here. If you want variable wiping, #define SHA1_WIPE_VARIABLES, if
// not, #define SHA1_NO_WIPE_VARIABLES. If you don't define anything, it
// defaults to wiping.

#if !defined(SHA1_WIPE_VARIABLES) && !defined(SHA1_NO_WIPE_VARIABLES)
#define SHA1_WIPE_VARIABLES
#endif

/////////////////////////////////////////////////////////////////////////////
// Define 8- and 32-bit variables
typedef uint8_t UINT_8;
typedef uint32_t UINT_32;

/////////////////////////////////////////////////////////////////////////////
// Declare SHA1 workspace

typedef union
{
        UINT_8  c[64];
        UINT_32 l[16];
} SHA1_WORKSPACE_BLOCK;

class CSHA1
{
public:
#ifdef SHA1_UTILITY_FUNCTIONS
        // Two different formats for ReportHash(...)
        enum
        {
                REPORT_HEX = 0,
                REPORT_DIGIT = 1
        };
#endif

        // Constructor and Destructor
        CSHA1();
        ~CSHA1();

        UINT_32 m_state[5];
        UINT_32 m_count[2];
        UINT_32 __reserved1[1];
        UINT_8  m_buffer[64];
        UINT_8  m_digest[20];
        UINT_32 __reserved2[3];

        void Reset();

        // Update the hash value
        void Update(UINT_8 *data, UINT_32 len);
#ifdef SHA1_UTILITY_FUNCTIONS
        bool HashFile(char *szFileName);
#endif

        // Finalize hash and report
        void Final();

        // Report functions: as pre-formatted and raw data
#ifdef SHA1_UTILITY_FUNCTIONS
        void ReportHash(char *szReport, unsigned char uReportType = REPORT_HEX);
#endif
        void GetHash(UINT_8 *puDest);

private:
        // Private SHA-1 transformation
        void Transform(UINT_32 *state, UINT_8 *buffer);

        // Member variables
        UINT_8 m_workspace[64];
        SHA1_WORKSPACE_BLOCK *m_block; // SHA1 pointer to the byte array above
};

#endif